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- The Chronological Peerage of England, hereditarytitles.com as of March 2, 2003; ; omits Normanby, misspells Hartington as Martington, places Marquess of Lorn and Kintyre in the peerage of England (Scotland is more probable).
- Encyclopædia Britannica 1911: "Buckingham and Normanby, John Sheffield, 1st Duke of (1648-1721)" mentions the title Marquess of Normanby in the peerage of England.
- RoyalArk on non-European dynasties, here China under the Manchu (last) Emperors, see also Glossary, and via Home look up other nations